27 lines
696 B
JavaScript
27 lines
696 B
JavaScript
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var toSrc = require('./toSrc');
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var stripCmt = require('./stripCmt');
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var startWith = require('./startWith');
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var isStr = require('./isStr');
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exports = function(fn) {
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var fnStr = stripCmt(isStr(fn) ? fn : toSrc(fn));
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var open;
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var close;
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if (
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!startWith(fnStr, 'async') &&
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!startWith(fnStr, 'function') &&
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!startWith(fnStr, '(')
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) {
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open = 0;
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close = fnStr.indexOf('=>');
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} else {
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open = fnStr.indexOf('(') + 1;
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close = fnStr.indexOf(')');
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}
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var ret = fnStr.slice(open, close);
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ret = ret.match(regArgNames);
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return ret === null ? [] : ret;
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};
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var regArgNames = /[^\s,]+/g;
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module.exports = exports;
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